Soils Test 2

Question 0

Oxidized al and reduced iron influence soil by?

Answer 0

Al-high chroma and hue

Fe-low chroma

Question 1

Practical value of soil color?

Answer 1

No real value

Question 2

Particle size of sand?

Answer 2

2.0-.05

Question 3

Size vs surface area?

Answer 3

Small particles = large surface area

Question 4

Sand and clay composed of?

Answer 4

Sand- quarts

Clay- silicate particles

Question 5

Soil structure

Answer 5

Arrangement of soil particles

Question 6

Extremes in soil structure?

Answer 6

Individual particles

Massive structure

Question 7

Per shapes?

Answer 7

Platty

Spheroidal

Question 8

Hold small aggregates together?

Answer 8

Electrostatic charges

Question 9

Soil tilh?

Answer 9

Ease of farmability

Question 10

How do soil crusts form?

Answer 10

After plowing it rains which causes crusting

Question 11

Cause of soil dispersion?

Answer 11

High sodium

Question 12

Conventional plowing device and effects?

Answer 12

Moldboard plow flips soil under, increase compaction, incorporates om and fertilizer

Question 13

No-till farming?

Answer 13

Tillage during planting only

Question 14

Particle density?

Answer 14

Is a measurement of soil that accounts only for soil not air or water.

Question 15

Normal range of bulk density.

Answer 15

.9-1.8

Question 16

Depth effect bulk density?

Answer 16

Greater depth bulk density increases

Question 17

Bulk density in regards to camp sites?

Answer 17

Edge of camp- low bulk density

Around fire ring- high bulk density

Question 18

Prevent compaction?

Answer 18

Remove traffic as much as possible

Use large tires with low inflation

Question 19

Fact about macropores?

Answer 19

Responsible for most movement of water

Question 20

Biopore?

Answer 20

Pore made of organic particles

Question 21

Engineering importance?

Answer 21

Campactability

Question 22

Capillarity in soil?

Answer 22

Ability for water to move upward against gravity

Question 23

Effect of sand on capillarity?

Answer 23

It is faster

Question 24

Energy levels of soil water

Answer 24

Gravity

Diffusion

Question 25

Water content vs water potential

Answer 25

Wc-total amount of water

Wp- difference in energy levels

Question 26

Available water?

Answer 26

Water held between field capacity and wilting point

Question 27

Unsaturated mass water flow

Answer 27

Flow takes place in small pours due to water potential

Question 28

Constants in terms of soil ie saturation, wilting point

Answer 28

Saturation-0 bars soil is completely wet

Wilting point- -15bars plants are stressed and need water

Question 29

When rain hits the ground it might?

Answer 29

Run off or infiltrate

Question 30

Determine water infiltration?

Answer 30

Quantity of plant vegetation

Slop

Question 31

Soil water replenished

Answer 31

Rain/irrigation system

Question 32

When to irrigate and how much

Answer 32

Meter and whc times root depth

Question 33

Problem with excess soil water

Answer 33

Leaching

Question 34

Why drainage is bad?

Answer 34

Changes characteristics of the field

Can be expensive

Question 35

Purpose of sub-surface drainage systems

Answer 35

Lowers water table